// 注册资料
func dockerGreetings(c *utils.Connection, data []byte) {
c.Src = string(data)
config.Dockers[string(data)] = time.Now().Unix()
log.Println("Docker:", string(data), "is online.")
log.Println("Dockers:", config.Dockers)
c.SendCommandString("docker_greetings_reply", config.ClusterAddress)
}
// 从连接中读取数据，解析并调用相应handler响应
func serve(conn net.Conn) {
var (
n int
ok bool
err error
cmd string
data []byte
payload []byte
handler HandlerFunc
connection *utils.Connection
)
connection = &utils.Connection{Conn: conn}
ClusterSwitcher.register <- connection
defer func() {
ClusterSwitcher.unregister <- connection
conn.Close()
}()
for {
if n, data, err = connection.Read(); err != nil {
break
}
cmd, payload = utils.CmdDecode(n, data)
log.Printf("Controller receive cmd:%s", cmd)
if handler, ok = ClusterSwitcher.handlers[cmd]; ok {
handler(connection, payload)
} else {
log.Printf("Command[%s] does not exist", cmd)
}
}
}
// docker连接到controller，保持着
func connectController(address string) {
var (
length int
exist bool
err error
cmd string
data []byte
payload []byte
conn net.Conn
handler HandlerFunc
connection *utils.Connection
)
defer func() { connCloseCh <- address }()
log.Printf("Connect controller %s", address)
conn, err = net.Dial("tcp", address)
if err != nil {
log.Println(err)
waitGroup.Done()
return
}
connection = &utils.Connection{
Conn: conn,
Src: address,
}
ClusterSwitcher.register <- connection
defer func() {
conn.Close()
ClusterSwitcher.unregister <- connection
}()
waitGroup.Done()
connection.SendCommandString("docker_greetings", config.ClusterAddress)
for {
if length, data, err = connection.Read(); err != nil {
break
}
cmd, payload = utils.CmdDecode(length, data)
log.Printf("Cmd:%s", cmd)
if handler, exist = ClusterSwitcher.handlers[cmd]; exist {
handler(connection, payload)
} else {
log.Printf("Command[%s] is not exist", cmd)
}
}
log.Printf("Controller %s is disconnect", address)
}
// 我收了个小弟
// todo:是否要审核
// 由于其知道我的名字我默认相信他
func dockerJoin(c *utils.Connection, data []byte) {
// 向集群结构配置里面添加新成员
config.Dockers[string(data)] = time.Now().Unix()
// 返回组织中领导层所有人姓名以便小弟有事时着他们
b, err := json.Marshal(config.Controllers)
if err != nil {
// 我收集的资料有误
c.SendCommandString("docker_join", "")
} else {
// 告知其组织的领导层所有人员姓名
c.SendCommandBytes("docker_join", b)
}
}
// 结拜了个兄弟
func controllerJoin(c *utils.Connection, data []byte) {
address := string(data)
// 把他名字记下来
config.Controllers[address] = time.Now().Unix()
// 把我以前结拜的所有兄弟告诉他，让他们也认识一下
b, err := json.Marshal(config.Controllers)
if err != nil {
log.Println(err)
c.SendCommandString("controller_join", "")
} else {
c.SendCommandBytes("controller_join", b)
}
// 先断开连接，以免其收到广播我发给小弟的通知
c.Conn.Close()
// 告知我的所有小弟，我认了个兄弟，以后的进贡也要给他们一份
message := fmt.Sprintf("%s %s", address, "controller_join_to_docker")
ClusterSwitcher.Broadcast(utils.PacketString(message))
log.Println("Controllers", config.Controllers)
}
func reportImagesAndContainers(c *utils.Connection) error {
// 读取镜像列表
log.Println("Report images start.")
imageJob := Eng.Job("images")
imageJob.Setenv("filter", "")
imageJob.Setenv("all", "0")
imageSrc, err := imageJob.Stdout.AddPipe()
if err != nil {
log.Fatalf("Create images receive pipe error:%s", err)
}
// 从管道读取事件数据并广播给所有controller
go func() {
imagesBytes, err := ioutil.ReadAll(imageSrc)
if err != nil {
log.Println("Read data error from pipe:", err)
}
c.SendCommandBytes("docker_images", imagesBytes)
}()
if err := imageJob.Run(); err != nil {
return err
}
// 读取容器列表
log.Println("Report containers start")
containerJob := Eng.Job("containers")
containerJob.Setenv("all", "1")
containerSrc, err := containerJob.Stdout.AddPipe()
if err != nil {
log.Fatalf("Create containers receive pipe error:%s", err)
}
// 从管道读取事件数据并广播给所有controller
go func() {
containersBytes, err := ioutil.ReadAll(containerSrc)
if err != nil {
log.Println("Read data error from pipe:", err)
}
c.SendCommandBytes("docker_containers", containersBytes)
}()
return containerJob.Run()
}
// 心跳
func heartbeat(c *utils.Connection, data []byte) {
c.SendCommandString("heartbeat", config.ClusterAddress)
}